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<script type="text/javascript">
function check(){
var username = $("#username").val();
$("#result").text("正在检测用户名是否可用");
var url="Login/login_validate.action";
$.post(url,{name:username},function(data){
$("#result").text(data);
$("#result").css("color","red");
},"text");
}
</script>
</head>
<body>
<form action="Login/login_input.action" method="post">
Username:<input type="text" id="username" name="user.username"/>
<input type="button" value="Check!" onclick="check();">
<div id="result"></div>
Password:<input type="password" id="password" name="user.password"/><br/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>
public class UserLoginAction extends ActionSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private User user;
public void validateUsername(){
String name = ServletActionContext.getRequest().getParameter("name");
this.getUser().setUsername(name);
PrintWriter pw = null;
try {
pw = ServletActionContext.getResponse().getWriter();
if(user.getUsername().equals("111")){
pw.write("已存在");
}else if(user.getUsername().equals("123")){
pw.write("可以使用");
}else{
pw.write("不可以使用");
}
} catch (IOException e) {
e.printStackTrace();
} finally{
pw.flush();
pw.close();
}
}
public class UserLoginAction extends ActionSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private User user;
private String result;
//get/set方法
public void validateUsername(){
String name = ServletActionContext.getRequest().getParameter("name");
this.getUser().setUsername(name);
PrintWriter pw = null;
try {
pw = ServletActionContext.getResponse().getWriter();
if(user.getUsername().equals("111")){
// pw.write("已存在");
result = "已存在";
}else if(user.getUsername().equals("123")){
pw.write("可以使用");
result = "可以使用";
}else{
pw.write("不可以使用");
result = "不可以使用";
}
} catch (IOException e) {
e.printStackTrace();
} finally{
pw.flush();
pw.close();
}
}
<script type="text/javascript">
function check(){
var username = $("#username").val();
$("#result").text("正在检测用户名是否可用");
var url="Login/login_validate.action";
$.post(url,{name:username},function(data){
$("#result").text(data.result);
$("#result").css("color","red");
},"json");
}
</script>
</head>
<body>
<form action="Login/login_input.action" method="post">
Username:<input type="text" id="username" name="user.username"/>
<input type="button" value="Check!" onclick="check();">
<div id="result"></div>
Password:<input type="password" id="password" name="user.password"/><br/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>
这样应该可以了吧